On a new XPS 15 9575 2-in-1 with BIOS 1.8.1, the symptoms are similar to
comment #24.  At the gdm login screen, the keyboard doesn't work at
first but is OK after 20-30 seconds. The touchpad is not affected.  The
Linux 4.15 kernel is not affected but later ones are.  I tried it with
4.18, 5.0 and 5.3 kernels.  I am running Mint 19.2, which uses the
Ubuntu kernels.

If I boot in recovery mode, the keyboard works on the recovery mode menu.  If I 
then exit to normal boot, the unresponsive keyboard recurs.  However, the 
elapsed time until it starts working
again is from the initial boot.  That is, if I wait 30 seconds in recovery mode 
before exiting to normal boot, the keyboard will then be working at the gdm 
screen.

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https://bugs.launchpad.net/bugs/1822394

Title:
  [Dell BIOSes dated 27 Mar 2019, XPS 9575, Precision 5530 2-in-1]
  laptop keyboard & touchpad not working at gdm screen after boot

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